Commented Unassigned: You cannot call a method on a null-valued expression [25978]

I keep getting this error message when trying to import SQL perfmon files.

An error occurred on...
If ($XmlCounterInstanceNode.NAME.ToLower() -eq $sCounterInstance.ToLower())
At C:\Program Files\PAL\PAL\PAL.ps1:1505 char:45 + If ($XmlCounterInstanceNode.NAME.ToLower ... + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
You cannot call a method on a null-valued expression.

I created the perfmon template using the PAL tool and then captured the perfmon data into a BLG. I get this error when PAL is parsing the data.

Tried it on 2 different machines now and get the same error. Different BLG files.
Comments: ** Comment from web user: jony08 **

continued...
I DO get the some of the performance report output, same as stated before me. BUT: "but the majority of Disk/Memory/CPU stats seem to be missing"